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This reverts commit e919a379.

Reason for revert: Flag was disabled for landing on 77 branch, so reverting this to enable it again for 78.

Original change's description:
> Disable feedback panels by default
> 
> Bug: 999653
> Change-Id: I3c2a65fc04817a1ced86ecbd5157877a6ac07244
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1778883
> Commit-Queue: Alex Danilo <adanilo@chromium.org>
> Commit-Queue: Austin Tankiang <austinct@chromium.org>
> Auto-Submit: Alex Danilo <adanilo@chromium.org>
> Reviewed-by: Austin Tankiang <austinct@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#692200}

TBR=adanilo@chromium.org,austinct@chromium.org

Change-Id: I7860daf73b48f18f7c05fc9155f16f328c09d124
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 999653
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779463Reviewed-by: Alex Danilo <adanilo@chromium.org>
Commit-Queue: Alex Danilo <adanilo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692263}